Why Radon Matters in DC
Radon is a naturally occurring gas that seeps up from the soil. You cannot see it or smell it. The DC area sits in the EPA's highest radon zone, which means elevated levels are common — especially in homes with crawl spaces and basements. The only way to know your level is to test.
Test Before You Mitigate
We do not sell mitigation to everyone — we start with testing. A simple test tells you whether your home actually has a radon problem and how bad it is. If levels are fine, you are done. If they are elevated, we design a mitigation system for your home. No test, no system. That is the rule.
How Mitigation Works
The standard fix is a soil depressurization system: a pipe run from under your vapor barrier or slab to above the roofline, with a fan that draws radon-laden air out before it enters your home. In an encapsulated crawl space, the sealed liner actually helps — it gives the system a tight surface to draw from, making mitigation more effective. That is why radon mitigation pairs so well with encapsulation: one sealed system, two problems solved.
How It Works: Our Process
Step 1 — Test. We test your radon levels and explain the results in plain language.
Step 2 — Design. If levels are elevated, we design the system: suction point, pipe route, fan placement.
Step 3 — Install. Usually a one-day job. The pipe exits discreetly and the fan mounts outside.
Step 4 — Retest. We verify the levels dropped. That is the whole point, and we prove it.
Radon and Real Estate
Radon tests come up in DC home sales all the time. If a buyer's test came back high, we can test, install, and retest on a timeline that works with your closing. Call us as soon as you get the result — do not let it kill the deal.
How the Fan System Works
Soil depressurization is elegantly simple: a suction point under your vapor barrier or slab connects to a PVC pipe that runs up and out above the roofline, with an inline fan creating constant gentle suction. The fan draws radon-laden soil gas from beneath the house and vents it safely above the roof before it can seep inside. The fan runs 24/7, uses about as much electricity as a light bulb, and has a simple monitor — usually a U-tube manometer — that shows at a glance that suction is present. No filters, no maintenance schedule, just quiet continuous operation.
Sealed Crawl Spaces and Radon: Why They Pair Well
An encapsulated crawl space actually makes radon mitigation more effective. The sealed liner gives the suction system a tight, continuous surface to draw from — instead of pulling air through gaps and leaks, the fan pulls evenly from the whole footprint. Many of our encapsulation clients add radon mitigation in the same project: one mobilization, one sealed system, and both the moisture and the soil gas handled together. If your test comes back elevated and your crawl space needs work anyway, combining them is the smart move.
How Often Should I Retest?
After installation, we retest to confirm the system brought levels down — that verification is part of the job, not an extra. After that, the EPA recommends retesting every couple of years, and any time you make major changes to the house (new HVAC, additions, finishing the basement). The system's suction monitor gives continuous assurance between tests: if the gauge shows suction, the system is working. If it ever reads zero, call us — it is usually a failed fan, which is a quick swap.
Call (301) 679-9193 to schedule radon testing.